ionic 2 - Inappbrowser event fire after second call - ionic2

Question

I use inappbrowser plugin in ionic 2 application like this :
import {InAppBrowser} from 'ionic-native';
and use it like this :
launch(url){
this.browser = new InAppBrowser( url, "_blank", "EnableViewPortScale=yes,closebuttoncaption=Done" );
this.browser.on("exit")
.subscribe(
() => {
this.close_event=true;
},
err => {
console.log("InAppBrowser Loadstop Event Error: " + err);
});
}
and in html :
<button ion-button icon-right color="danger" (click)="launch('https://www.example.com')">launch
<ion-icon name="refresh"></ion-icon>
when click on launch button for first time and after close browser, exit event not fire but when for second time click on launch button and after close browser exit event is fire

Answer 1

Perhaps the first time you click on Launch button, the device platform is not ready yet?
Try to put the calls to any InAppBrowser methods inside Plaform.ready(), like so:
...
import { Platform } from 'ionic-angular';
import { InAppBrowser } from '#ionic-native/in-app-browser';
...
export class HomePage {
private iab: InAppBrowser;
private platform: Platform;
private browser;
...
var launch = function(url) {
this.platform.ready().then(
() => {
this.browser = this.iab.create( url, "_blank", "EnableViewPortScale=yes,closebuttoncaption=Done" );
this.browser.on("exit").subscribe(
(event) => {
this.close_event = true;
},
(err) => {
console.log("InAppBrowser Loadstop Event Error: " + err);
}
);
}
);
};
...
}